Apply suggestion from Coderabbit

Author: wojtekmaj

app/utils/install-command.ts

@@ -140,12 +140,12 @@ function hasReadmeDevInstallHint(packageName: string, readmeHtml?: string | null
   const patterns = [
     // npm install -D pkg / pnpm add --save-dev pkg
     new RegExp(
-      String.raw`(?:npm|pnpm|yarn|bun|vlt)\s+(?:install|add|i)\s+(?:--save-dev|-d)\s+${packageSpec}`,
+      String.raw`(?:npm|pnpm|yarn|bun|vlt)\s+(?:install|add|i)\s+(?:--save-dev|--dev|-d)\s+${packageSpec}`,
       'i',
     ),
     // npm install pkg --save-dev / pnpm add pkg -D
     new RegExp(
-      String.raw`(?:npm|pnpm|yarn|bun|vlt)\s+(?:install|add|i)\s+${packageSpec}\s+(?:--save-dev|-d)`,
+      String.raw`(?:npm|pnpm|yarn|bun|vlt)\s+(?:install|add|i)\s+${packageSpec}\s+(?:--save-dev|--dev|-d)`,
       'i',
     ),
     // deno add -D npm:pkg

test/unit/app/utils/install-command.spec.ts

@@ -310,6 +310,15 @@ describe('install command generation', () => {
       })
     })
 
+    it('suggests dev dependency from README --dev flag hints', () => {
+      const readmeHtml = '<p><code>yarn add --dev some-tool</code></p>'
+
+      expect(getDevDependencySuggestion('some-tool', readmeHtml)).toEqual({
+        recommended: true,
+        reason: 'readme-hint',
+      })
+    })
+
     it('does not suggest dev dependency for runtime packages without hints', () => {
       expect(getDevDependencySuggestion('react')).toEqual({
         recommended: false,